Issue with FeedbackPanel in onError and FileUpload in Wicket 10.3.0

[Erwan Tanajaya]

Hello all,

I found an issue with AjaxButton and FileUploadField, every time i upload file 
more than 5MB error message not shown in FeedbackPanel, custom error message 
also not shown in FeedbackPanel, is there something wrong with my code ?

this is my code :

        // FeedbackPanel outside the form
        FeedbackPanel feedbackPanel = new FeedbackPanel("notifications");
        feedbackPanel.setOutputMarkupId(true);
        add(feedbackPanel);

        // Form for file upload
        Form<Void> form = new Form<>("form");
        form.setMultiPart(true);
        form.setMaxSize(Bytes.megabytes(5)); // Set a file size limit (5 MB)
        form.setOutputMarkupId(true);
        add(form);

        // FileUploadField for file input
        FileUploadField fileUploadField = new FileUploadField("fileUpload");
        form.add(fileUploadField);

        // AjaxButton for submission
        AjaxButton ajaxButton = new AjaxButton("submitButton", form) {
            @Override
            protected void onSubmit(AjaxRequestTarget target) {
                super.onSubmit(target);

                info("File uploaded successfully.");

                target.add(feedbackPanel); // Update the FeedbackPanel
            }

            @Override
            protected void onError(AjaxRequestTarget target) {
                super.onError(target);

                // Add custom error message manually
                error("A custom error message for testing.");
              
                // Ensure errors are visible
                target.add(feedbackPanel); // Update the FeedbackPanel
            }
        };
        ajaxButton.setOutputMarkupId(true);
        form.add(ajaxButton);



Environtment :
Wicket 10.3.0
Java 21
Tomcat 11
Maven 3.9.9

Best Regards,
Erwan